Hmm....I actually read once before that in some countries, they use urine to cure leather boots. The urine, if left to stand long enough turns into ammonia. Useful, maybe, but not sanitary. Here is an excerp from an article I read:
"In the olden times, people used different techniques in producing leather. After scraping of the flesh from the animal by using a bone, stone scraper or a metal knife, they would put a kind of chemical or salt on the skin in order to process it. Some even used urine back then. The tanners also collected urine from toilets in public areas as well as from certain homes. After collecting the urine, they would let it stand for about a week until the urine turns into ammonia, which they would put onto the skin so as to cure it. These processes are the ones used by tanners before just to create leather."
I also watched man v. wild the one day. He was in a desert and made purified drinking water from urine. He got two clear water bottles and urinated in one. He taped them together and buried the empty one under sand and left the urinated one in the sun. It produced condensation into the buried one creating purified water. They did a test on it, and it was purer than tap water.